Yes, I was in workforce in 2008 and before that. And I described you what I saw.
I also will tel lyou another tale. In 2011 we were looking to build a fence/wall in the garden. We took 10 quotes. We didnt have much money but the work was urgent. the two 'British' companies quoted us £3000 and £3250 for a 1,5m tall 3m long wall, I almost fell over.
The five other companies (Romanina, Bulgarian, Turkish) quoted is £1500-£1800 and in this region. All paid taxtes, it was not a black market job with cash in hand.
The wall didnt have to cost over £3000. For a long time there was no competition and some industries were raking it in. And then puff. Competition turned up and prices lowered, but they were inflated to begin with.
You would assume that if not for the competition, we would have paid the £3000 to an Englishman. I wouldnt have because I had nowhere near the amount of money they expected. So yes, this is why some people lost out, ebcause all of a sudden they could not just request whatever they wanted for stuff that was not worth it.